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Figure 1. Network costs (summary)
Creating cost functions
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Figure 2. Network Costs (Storage Break Points)
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| Although you can define storage breakpoints for storage A in terms of storage B, you should avoid doing so because it can lead to infeasible solutions. |
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A more formal specification of the cost calculation is:
| Equation 1 |   |
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Recall that negative costs are incentives. Accordingly, in this table, the greatest incentive is to retain any water in the bottom-most 10% of the capacity of the storage (for carry-over to the next time-step), followed by the water in the next 40% of the capacity of the storage. By interleaving base costs and increment values, releases from multiple storages can be controlled quite precisely to maintain a desired balance.
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Figure 3. Carryover Arc Costs vs Storage Volume
Applying cost functions
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Figure 4. Network costs (Storage targets)
You can also import storage targets from a .CSV file. The format of the file is shown in Table 3. Note that the column ordering in the .CSV file does not match the display in Figure 4.
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Figure 5. Network costs (Demand priorities)
You can control the order in which shortfalls are satisfied. The Priority column in Figure 5 shows which demand component of the model has will receive water via its shortfall arcs.
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| Info | ||
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| Note: In a netLP system, refer to Operating targets when setting up a storage node. |
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